2001 Volvo S60

Engine Performance problem
2001 Volvo S60 4 cyl Front Wheel Drive Automatic 120 miles

I have a 2001 s60 2.4t volvo and sometimes my check engine light comes on and stay on for a couple weeks and then it goes off for a couple of months. I am trying to figure out why is it doing this and it has been professional check reset and it seem to continue to do this.
August 10, 2008.

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